Lock

Abstract

A lock comprising, within a box-like supporting body and associated with actuation elements which are available to the action of the user and/or of other devices, three locking beaks: two first lateral ones, whose free tips are shaped so as to form mutually opposite claws which lie on the plane of the closure and opening movement, and a third central beak, which is kinematically connected and coordinated with respect to the two first beaks and is provided, at its free tip, with at least one locking element. The three beaks define, in association with the actuation elements, at least two stable working positions: a first open position, in which the beaks lie substantially completely within the box-like supporting body, and a second closed position, in which the beaks protrude from the box-like supporting body with their free tips so as to lock the components with which they are associated.

What is claimed is:  
     
       1. A lock, comprising, within a box-like supporting body and associated with actuation means which are available to the action of any of a user and of other devices, two first lateral locking beaks having free tips shaped so as to form mutually opposite claws lying on a plane of a closure and opening movement, said lock further comprising: 
       a third central beak, which is kinematically connected and coordinated with respect to the two first beaks;  
       at least one locking element, provided at a free tip of said third beak, said three beaks defining, in association with said actuation means, at least two stable working positions: a first open position, in which said two first beaks and said third beak lie completely within said box-like supporting body, and a second closed position, in which said two first beaks and sad third beak protrude from said box-like supporting body with said free tips thereof so as to lock components with which the beaks are associated, said third beak acting as a bolt; and  
       two first mutually opposite tabs formed on the contour of said third beak, said first tabs providing a corresponding number of stoke limit abutment surfaces for said two first beaks both during closure and during opening.  
     
     
       2. The lock of  claim 1 , wherein said third beak comprises, at a free end thereof, at least one locking element, said locking element being constituted by a cylinder pivoted about an axis lying on a same plane of arrangement as said claws. 
     
     
       3. The lock of  claim 1 , wherein said third beak is plate-shaped. 
     
     
       4. The lock of  claim 3 , wherein said two first beaks are plate-shaped and contoured so as to form two second tabs, said second tabs being adapted to abut, at a stroke end thereof, against said first tabs during closure. 
     
     
       5. The lock of  claim 4 , wherein said two first beaks have edge portions which are shaped so as to abut, at the stroke end thereof, against said first tabs during opening. 
     
     
       6. The lock of  claim 1 , wherein said actuation means comprise: two pairs of plates, each pair being constituted by a first plate, which is fixed to said supporting body and is provided with three first linear guides, said first linear guides being constituted by walls of a corresponding number of slotted holes provided at said first plate, and by a second plate, which is movable parallel to said first plate, said second plate being provided with three second guides, said second guides being constituted by walls of a corresponding number of slotted holes, provided at said second plate, which are L-shaped and correspond to said first guides, each one of said second guides being formed by a portion which is inclined with respect to the corresponding first guide, and by a portion which is perpendicular to said corresponding first guide; and three pivots which are slidingly inserted in said first and second guides, said pivots being pivoted at through holes of said corresponding beaks, so as to determine movement of the beaks when said second plate slides. 
     
     
       7. The lock of  claim 6 , wherein said actuation means further comprise elastic contrast pusher elements for each one of said two first beaks. 
     
     
       8. The lock of  claim 7 , wherein said elastic contrast pusher means are constituted by helical springs, which are pivoted in mutually opposite pivoting points, which are provided fixed at the box-like supporting body. 
     
     
       9. A lock, comprising, within a box-like supporting body and associated with actuation means which are available to the action of any of a user and of other devices, two first lateral locking beaks having free tips shaped so as to form mutually opposite claws lying on a plane of a closure and opening movement, said lock further comprising: 
       a third central beak, which is kinematically connected and coordinated with respect to the two first beaks;  
       at least one locking element, provided at a free tip of said third beak, said locking element being constituted by a cylinder pivoted about an axis lying on a same plane of arrangement as said claws, and said three beaks defining, in association with said actuation means, at least two stable working positions: a first open position, in which said beaks lie substantially completely within said box-like supporting body, and a second closed position, in which said beaks protrude from said box-like supporting body with said free tips thereof so as to lock components with which the beaks are associated.  
     
     
       10. The lock of  claim 9 , wherein said third beak is plate-shaped and contoured so as to form two first mutually opposite tabs, said first tabs providing a corresponding number of stroke limit abutment surfaces for said two first beaks, both during closure and during opening. 
     
     
       11. The lock of  claim 10 , wherein said two first beaks are plate-shaped and contoured so as to form two second tabs, said second tabs being adapted to abut, at a stroke end thereof, against said first tabs during closure. 
     
     
       12. The lock of  claim 11 , wherein said two first beaks have edge portions which are shaped so as to abut, at the stroke end thereof, against said first tabs during opening. 
     
     
       13. The lock of  claim 9 , wherein said actuation means comprise: two pairs of plates, each pair being constituted by a first plate, which is fixed to said supporting body and is provided with three first linear guides, said first linear guides being constituted by walls of a corresponding number of slotted holes provided at said first plate, and by a second plate, which is movable parallel to said first plate, said second plate being provided with three second guides, said second guides being constituted by walls of a corresponding number of slotted holes, provided at said second plate, which are L-shaped and correspond to said first guides, each one of said second guides being formed by a portion which is inclined with respect to the corresponding first guide, and by a portion which is perpendicular to said corresponding first guide; and three pivots which are slidingly inserted in said first and second guides, said pivots being pivoted at through holes of said corresponding beaks, so as to determine movement of the beaks when said second plate slides. 
     
     
       14. The lock of  claim 13 , wherein said actuation means further comprise elastic contrast pusher elements for each one of said two first beaks. 
     
     
       15. The lock of  claim 14 , wherein said elastic contrast pusher means are constituted by helical springs, which are pivoted in mutually opposite pivoting points, which are provided fixed at the box-like supporting body. 
     
     
       16. A lock, comprising, within a box-like supporting body and associated with actuation means which are available to the action of any of a user and of other devices, two first lateral locking beaks having free tips shaped so as to form mutually opposite claws lying on a plane of a closure and opening movement, said lock further comprising: a third central beak, which is kinematically connected and coordinated with respect to the two first beaks; at least one locking element, provided at a free tip of said third beak, said three beaks defining, in association with said actuation means, at least two stable working positions: a first open position, in which said beaks lie substantially completely within said box-like supporting body, and a second closed position, in which said beaks protrude from said box-like supporting body with said free tips thereof so as to lock components with which the beaks are associated; and said actuation means comprising two pairs of plates, each pair being constituted by a first plate, which is fixed to said supporting body and is provided with three first linear guides, said first linear guides being constituted by walls of a corresponding number of slotted holes provided at said first plate, and by a second plate, which is movable parallel to said first plate, said second plate being provided with three second guides, said second guides being constituted by walls of a corresponding number of slotted holes, provided at said second plate, which are L-shaped and correspond to said first guides, each one of said second guides being formed by a portion which is inclined with respect to the corresponding first guide, and by a portion which is perpendicular to said corresponding first guide; and three pivots which are slidingly inserted in said first and second guides, said pivots being pivoted at through holes of said corresponding beaks, so as to determine movement of the beaks when said second plate slides. 
     
     
       17. The lock of  claim 16 , wherein said actuation means further comprise elastic contrast pusher elements for each one of said two first beaks. 
     
     
       18. The lock of  claim 17 , wherein said elastic contrast pusher means are constituted by helical springs, which are pivoted in mutually opposite pivoting points, which are provided fixed at the box-like supporting body. 
     
     
       19. The lock of  claim 16 , wherein said third beak comprises, at a free end thereof, at least one locking element, said locking element being constituted by a cylinder pivoted about an axis lying on a same plane of arrangement as said claws. 
     
     
       20. The lock of  claim 16 , wherein said third beak is plate-shaped and contoured so as to form two first mutually opposite tabs, said first tabs providing a corresponding number of stroke limit abutment surfaces for said two first beaks, both during closure and during opening. 
     
     
       21. The lock of  claim 20 , wherein said two first beaks are plate-shaped and contoured so as to form two second tabs, said second tabs being adapted to abut, at a stroke end thereof, against said first tabs during closure. 
     
     
       22. The lock of  claim 21 , wherein said two first beaks have edge portions which are shaped so as to abut, at the stroke end thereof, against said first tabs during opening.